Analysis of Influence of Artificial Hard Shell Layer on Bridge Pile Foundation under Preloading in Beach Area:Taking Shiyitang Expressway in Zhejiang Province as an Example
Based on the existing deep soft soil geological conditions in beach area,greater challenges were brought to the construction of cast-in-place box girders.Relying on the first phase project of Shiyitang Expressway in Zhejiang Province,the influence of artificially solidified hard shell layer on bridge pile foundation under preloading load was studied.Based on the soil hardening model,a three-dimensional numerical calculation model was established.The variation law of axial force,lateral friction resistance and horizontal displacement of pile body under different depth of hard shell was compared.The results show that when the thickness of the hard shell is 2 m,the axial force of the pile is reduced by about 16％.The thickness of the hard shell layer will change the transfer depth of the negative friction resistance,which shows that the thicker the thickness of the hard shell layer,the more the neutral point of the pile side resistance moves up.In addition,in a certain depth influence range,the hard shell layer can effectively control the horizontal displacement of the pile top and the pile body at different depths.The larger the thickness of the hard shell layer,the smaller the horizontal displacement of the pile top.Finally,the influence of soil modulus on the horizontal displacement of the pile was analyzed.It is found that the horizontal displacement of the pile will decrease with the increase of the compression modulus of the soil,and the influence of soil unloading/reloading stiffness modulus Eur is higher than that of soil deflection loading stiffness modulus E50 and lateral compression stiffness modulus of soil Eeod.
intertidal zonein-situ solidificationfull framinglateral displacement of the pilecompression modulus
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